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-3m + 4n - 6 + 7n - 8m + 10
(-3m - 8m ) + (4n + 7n ) - 6 + 10
- 11m + 11 n + 4
b. 15a + 7b - 5c + (-11a -12b+13d )
15a - 11a + 7b - 12b - 5c + 13d
4a - 5b - 5c +13
b. 4a-5b-5c +13d